Glazing mullion



FIG. 1 is a front, top and right side perspective view of a partial length of a glazing mullion center assembly showing my new design. The dotted portions are for reference only and do not form a part of my design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a partial rear view thereof;

FIG. 4 is a partial left side view thereof;

FIG. 5 is a partial front view thereof; and,

FIG. 6 is a partial right side view thereof. 

The ornamental design for a glazing mullion, substantially as shown and described. 